Characterisation of natural organic matter (NOM) removed by magnetic ion exchange resin (MIEX® Resin)

2009 ◽  
Vol 9 (2) ◽  
pp. 199-205 ◽  
Author(s):  
M. R. D. Mergen ◽  
B. J. Adams ◽  
G. M. Vero ◽  
T. A. Price ◽  
S. A. Parsons ◽  
...  
Keyword(s):  
Charge Density ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Low Molecular Weight ◽  
Raw Water ◽  
Density Measurements ◽  
Organic Species ◽  
Magnetic Ion ◽  
Insight Into

The aim of the research presented in this paper was to gain greater insight into the characteristics of NOM removed by MIEX® Resin. Previous studies have shown that MIEX® Resin increases the level of removable DOC when used in combination with coagulation, suggesting that these two processes target a different type of organics. Initially the characteristics of DOC in regenerant solutions from four different MIEX® Resin treatment plants were analysed and compared to DOC in the respective raw water. Following this the raw water and the regenerant solutions were coagulated and the characteristics of the residual DOC analysed and compared to the regenerant solutions prior to coagulation. From the regenerant solutions it was seen that MIEX® Resin targets DOC of increased UV254 absorbance, increased charge density and of mid to low molecular weight (5 to 2 kDa). In terms of hydrophobicity no preference of MIEX® Resin for a specific NOM type was seen. The presence of hydrophilic neutral acids in the regenerant solution was unexpected since the removal of only highly charged organic species was expected. Charge density measurements however revealed the presence of functional groups, allowing hydrophilic neutrals to be removed by anion exchange. Comparative coagulation of the raw water and regenerant solution showed that both a residual DOC of similar hydrophobicity in the sub 3 kDa area. Considering that this DOC fraction was present in the regenerant it was concluded that MIEX® Resin removes organics recalcitrant to coagulation from raw water and therefore increases DOC removal when both methods are combined.

Application of a Magnetic Resin (MIEX) in Raw Water

2013 ◽  
Vol 361-363 ◽  
pp. 801-804
Author(s):  
Jian Wei Ma ◽  
Ya Rui Song
Keyword(s):  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Raw Water ◽  
Nitrogen And Phosphorus ◽  
Dissolved Organic Matters ◽  
Primary Focus ◽  
Magnetic Ion ◽  
Magnetic Resin

The objective of this research was to compare enhanced coagulation with anion exchange for removal of natural organic matter (NOM) and bromide. Treatment with a magnetic ion exchange resin (MIEX) was the primary focus of this study. The performance of the magnetic ion exchange resin,MIEX, in the treatment of raw water was investigated. MIEX can effectively remove UV-absorbing substances DOC. The removal of organic substances is accompanied by the elimination of other undesirable components, such as nitrogen and phosphorus. The optimal process parameters are at resin doses of 5-10 mL L1and contact time of 10-15 min, as determined via jartests. Based on this study, MIEX treatment is a suitable and efficient pretreatment method for the removal of extra dissolved organic matters and nitrates in raw water .

Purification Raw Water by Magnetic Resin (MIEX)

2013 ◽  
Vol 726-731 ◽  
pp. 3185-3188
Author(s):  
Jian Wei Ma ◽  
Ya Rui Song
Keyword(s):  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Raw Water ◽  
Nitrogen And Phosphorus ◽  
Dissolved Organic Matters ◽  
Primary Focus ◽  
Magnetic Ion ◽  
Magnetic Resin

The objective of this research was to compare enhanced coagulation with anion exchange for removal of natural organic matter (NOM) and bromide. Treatment with a magnetic ion exchange resin (MIEX) was the primary focus of this study. The performance of the magnetic ion exchange resin,MIEX, in the treatment of raw water was investigated. MIEX can effectively remove UV-absorbing substances DOC. The removal of organic substances is accompanied by the elimination of other undesirable components, such as nitrogen and phosphorus. The optimal process parameters are at resin doses of 5-10 mL L1and contact time of 10-15 min, as determined via jartests. Based on this study, MIEX treatment is a suitable and efficient pretreatment method for the removal of extra dissolved organic matters and nitrates in raw water .

Competitive removal of DOM and bromide in raw waters by MIEX and iron coagulation

2013 ◽  
Vol 13 (1) ◽  
pp. 123-129
Author(s):  
Zhizhen Xu ◽  
Ruyuan Jiao ◽  
Xiaomin Yan ◽  
Dongsheng Wang ◽  
Mary Drikas ◽  
...  
Keyword(s):  
High Performance ◽  
Fluorescence Spectra ◽  
Ion Exchange Resin ◽  
Disinfection Byproducts ◽  
Size Exclusion ◽  
Low Molecular Weight ◽  
Raw Water ◽  
Potential Risks ◽  
Safety Of Drinking Water ◽  
Magnetic Ion

Dissolved organic matter (DOM) and bromide as principal precursors to halogenated disinfection byproducts (DBPs) have potential risks on the safety of drinking water after disinfection. Removal of DOM and bromide in raw water from two different waterworks using magnetic ion exchange resin (MIEX), ferric coagulation and their combination was investigated. Results showed that as MIEX dose increased, DOM and bromide coexisting in raw water could be removed effectively. DOM tended to be mainly removed by MIEX at low dose (<4 mL/L), regardless of the bromide concentration. Bromide could compete for exchange sites with DOM at high MIEX dosage (>4 mL/L). The fluorescence spectra and high performance size-exclusion chromatogram analysis indicated that at low MIEX dosage, bromide decreased the removal of low molecular weight (MW), soluble microbial byproduct-like and aromatic protein-like organic matters, which had lower affinity with MIEX in raw water. The removal of high MW humic acid, which presented greater affinity with MIEX, was not influenced at low MIEX dose but decreased at high MIEX dose with the addition of bromide. The combination of MIEX and ferric coagulation significantly enhanced the removal of DOM and reduced the requisite ferric dose by at least 67% compared to coagulation alone.

The removal of natural organic matter from selected Turkish source waters using magnetic ion exchange resin (MIEX®)

2007 ◽  
Vol 67 (12) ◽  
pp. 1495-1504 ◽  
Author(s):  
Mehmet Kitis ◽  
B. İlker Harman ◽  
Nevzat O. Yigit ◽  
Mehmet Beyhan ◽  
Hung Nguyen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion ◽  
Source Waters

scholarly journals Magnetic ion-exchange resin treatment: Impact of water type and resin use

2008 ◽  
Vol 42 (8-9) ◽  
pp. 1977-1988 ◽  
Author(s):  
Max R.D. Mergen ◽  
Bruce Jefferson ◽  
Simon A. Parsons ◽  
Peter Jarvis
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Water Type ◽  
Magnetic Ion ◽  
Resin Treatment

Instabilities in the System NMMO/Water/Cellulose (Lyocell Process) Caused by Polonowski Type Reactions

Holzforschung ◽  
2002 ◽  
Vol 56 (2) ◽  
pp. 199-208 ◽  
Author(s):  
Thomas Rosenau ◽  
Antje Potthast ◽  
Andreas Hofinger ◽  
Herbert Sixta ◽  
Paul Kosma
Keyword(s):  
Molecular Weight ◽  
Acetic Acid ◽  
Exchange Resin ◽  
Degradation Products ◽  
Ion Exchange Resin ◽  
Low Molecular Weight ◽  
Acid Component ◽  
Degradation Reactions ◽  
Polyglucuronic Acid

Summary Polonowski type degradation reactions are a major reason for the frequently observed instability of solutions of cellulose in N-methylmorpholine-N-oxide monohydrate (NMMO, 1). The degradation is induced by degradation products of cellulose and NMMO generated in situ in the Lyocell system. The presence of both an amine component, such as morpholine or N-methylmorpholine, and an acid component is required for the decomposition process to proceed. The latter might be a low-molecular-weight compound, such as formic acid, acetic acid or gluconic acid, or also a high-molecular-weight acid, such as polyglucuronic acid or ion exchange resin.

Adsorptive Removal of Natural Organic Matter during Drinking Water Treatment

1999 ◽  
Vol 40 (9) ◽  
pp. 183-190 ◽  
Author(s):  
S. G. J. Heijman ◽  
A. M. van Paassen ◽  
W. G. J. van der Meer ◽  
R. Hopman
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Drinking Water Treatment ◽  
Ion Exchange Resin ◽  
Batch Experiments ◽  
Colour Removal ◽  
Adsorptive Removal ◽  
First Choice

For the removal of DOC (and colour) several treatment steps are suggested. If it is also necessary to remove hardness nanofiltration is probably the first choice. For colour removal without softening a number of adsorbents are suggested in the literature. In order to estimate the costs of these treatment steps a dynamic column model based on batch experiments was used to predict the service time of the columns filled with different adsorbents. Also the (on site) regeneration of the different adsorbents was investigated in batch experiments. Especially the ion exchange resin was very promising. The costs of the treatment of one m3 water with a column filled with an ion exchange resin was estimated for the investigated case at 0.05 Euro.

A magnetic ion exchange resin with high efficiency of removing Cr (VI)

2020 ◽  
Vol 604 ◽  
pp. 125279
Author(s):  
Yafeng Ren ◽  
Youhua Han ◽  
Xingfeng Lei ◽  
Chuan Lu ◽  
Jin Liu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
High Efficiency ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion

Performances and Mechanism of Methyl Orange and Congo Red Adsorbed on the Magnetic Ion-Exchange Resin

2020 ◽  
Vol 65 (2) ◽  
pp. 725-736 ◽  
Author(s):  
Yunhan Jia ◽  
Lei Ding ◽  
Peiyue Ren ◽  
Meiying Zhong ◽  
Jiangya Ma ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Ion Exchange ◽  
Congo Red ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion

Fate of steroid hormone micropollutant estradiol in a hybrid magnetic ion exchange resin-nanofiltration process

2019 ◽  
Vol 16 (8) ◽  
pp. 630
Author(s):  
Alessandra Imbrogno ◽  
Prantik Samanta ◽  
Andrea I. Schäfer
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Ion Exchange ◽  
Membrane Fouling ◽  
Exchange Resin ◽  
Environmental Concern ◽  
Steroid Hormone ◽  
Ion Exchange Resin ◽  
Feed Water ◽  
Magnetic Ion

Environmental contextContamination of surface water by micropollutants is a major environmental concern because of their high persistence and toxicity. Micropollutants are only partially removed in nanofiltration water treatment systems, encouraging the investigation of more complex systems involving partitioning with membrane materials, organic matter and ion exchange resins. This study elucidates the micropollutant partitioning mechanisms in this complex water treatment system. AbstractThe accumulation of micropollutants, such as steroid hormones, in magnetic ion exchange resin-nanofiltration (MIEX-NF) poses a risk to the environmental contamination of surface water where the treated water is discharged. In this study, the partitioning of the steroid hormone estradiol (E2) with humic acid (HA), MIEX and the membrane is investigated at different feed water conditions (e.g. pH and presence of calcium). The transport and adsorption of E2 in NF is not affected significantly by the E2-HA interaction. Indeed, E2 partitions with HA between 8% and 25% at different pH. This is attributed to the presence of calcium ions, which reduces the number of HA molecules available to interact with E2 molecules. The calcium interference is evident especially at pH>10, where calcite and HA precipitate to result in irreversible membrane fouling. In the hybrid MIEX-NF process, the E2-MIEX interaction occurs at all pH conditions. Approximately 40% of the E2 total mass partitions with MIEX. This is significantly higher than E2 accumulation in NF. Since the partitioning is at least partially reversible, this poses a risk for accidental E2 release into the process streams.

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